[Serializer] Use pack to install

TimoBakx · TimoBakx · commit 1ffc677a3fb2 · 2019-06-10T21:17:14.000+02:00
diff --git a/serializer.rst b/serializer.rst
@@ -19,7 +19,7 @@ install the serializer before using it:
 
 .. code-block:: terminal
 
-    $ composer require symfony/serializer
+    $ composer require symfony/serializer-pack
 
 Using the Serializer Service
 ----------------------------
